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Open AccessArticle

Ultrasonic Monitoring of the Interaction between Cement Matrix and Alkaline Silicate Solution in Self-Healing Systems

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Department of Applied Science and Technology, Condensed Matter and Complex Systems Physics Institute, Politecnico di Torino, 10129 Torino, Italy
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Laboratoire de Physique des Matériaux, Université des Sciences et de la Technologie Houari Boumediene, BP 32 El Alia, Bab Ezzouar 16111, Algeria
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Department of Structural, Geotechnical and Building Engineering, Politecnico di Torino, 10129 Torino, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Nele De Belie
Materials 2017, 10(1), 46; https://doi.org/10.3390/ma10010046
Received: 22 November 2016 / Revised: 23 December 2016 / Accepted: 3 January 2017 / Published: 7 January 2017
(This article belongs to the Special Issue Self-Healing Concrete)
Alkaline solutions, such as sodium, potassium or lithium silicates, appear to be very promising as healing agents for the development of encapsulated self-healing concretes. However, the evolution of their mechanical and acoustic properties in time has not yet been completely clarified, especially regarding their behavior and related kinetics when they are used in the form of a thin layer in contact with a hardened cement matrix. This study aims to monitor, using linear and nonlinear ultrasonic methods, the evolution of a sodium silicate solution interacting with a cement matrix in the presence of localized cracks. The ultrasonic inspection via linear methods revealed that an almost complete recovery of the elastic and acoustic properties occurred within a few days of healing. The nonlinear ultrasonic measurements contributed to provide further insight into the kinetics of the recovery due to the presence of the healing agent. A good regain of mechanical performance was ascertained through flexural tests at the end of the healing process, confirming the suitability of sodium silicate as a healing agent for self-healing cementitious systems. View Full-Text
Keywords: self-healing concrete; sodium silicate; cracks; NDT; nonlinear ultrasonic inspection; scaling subtraction method self-healing concrete; sodium silicate; cracks; NDT; nonlinear ultrasonic inspection; scaling subtraction method
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MDPI and ACS Style

Ait Ouarabi, M.; Antonaci, P.; Boubenider, F.; Gliozzi, A.S.; Scalerandi, M. Ultrasonic Monitoring of the Interaction between Cement Matrix and Alkaline Silicate Solution in Self-Healing Systems. Materials 2017, 10, 46.

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